Critical Measurement Set with PMU for Hybrid State Estimation

This paper presents a method for designing minimal measurement set that include both Supervisory Control And Data Acquisition (SCADA) and Synchronized Phasor Measurements Units (SPMU) data for a Hybrid State Estimation (HSE). The optimal location of Phasor Measurement Units (PMU) is performed by Binary Integer Linear Programming (BILP). Among these PMUs, the highest priority indexed PMUs are selected for implementation and the remaining unobservable buses are made to be observable using traditional measurements. An augmented bus matrix corresponds to each unobservable node in a network is calculated. Power Injection and Power Flow measurements are to be placed in the unobservable node and branch of the power system network based on the fixed index value. The hybrid measurement jacobian matrix is formed with the critical measurements and system observability has been proved numerically. System states are evaluated using the chosen measurements by applying Hybrid State Estimation and are validated through the simulations carried out on standard IEEE systems and New England systems and the results are compared.